Whenever I try to open any files I get the error messages "StaadFoundation MFC Application has stopped working" / "Attempted an unsupported operation".
Right click on STAAD.foundation Advanced icon (short-cut) and select the option "Run as administrator". Open a file and see if the issue is resolved.
If not, download the latest version of the software. Follow the software downloads instructions as mentioned in the following link
Once downloaded, uninstall the software from Control Panel -> Programs and Features menu.
Now, right -click on the downloaded file and select the option "Run as administrator" (though you may be logged in as the administrator).
Once done, right-click on STAAD.Foundation Advanced icon (short-cut) and select the option "Run as administrator" to make sure all the settings are done correctly.